refactor: use modernc sqlite driver as default (#37562)

The mattn driver is still kept, can be enabled by
TAGS="sqlite_mattn sqlite_unlock_notify"

---------

Co-authored-by: TheFox0x7 <thefox0x7@gmail.com>

options/locale/locale_en-US.json

@@ -313,7 +313,6 @@
   "install.admin_email": "Email Address",
   "install.install_btn_confirm": "Install Gitea",
   "install.test_git_failed": "Could not test 'git' command: %v",
-  "install.sqlite3_not_available": "This Gitea version does not support SQLite3. Please download the official binary version from %s (not the 'gobuild' version).",
   "install.invalid_db_setting": "The database settings are invalid: %v",
   "install.invalid_db_table": "The database table \"%s\" is invalid: %v",
   "install.invalid_repo_path": "The repository root path is invalid: %v",